Fatigue crack growth modelling for S355 structural steel considering plasticity-induced crack-closure by means of UniGrow model

Bruno Pedrosa*, José Correia, Grzegorz Lesiuk, Carlos Rebelo, Milan Veljkovic

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
17 Downloads (Pure)

Abstract

The UniGrow model is an analytical procedure to assess the fatigue crack growth based on elastic–plastic crack tip stresses and strains. The assumption is that fatigue crack growth (FCG) can be considered as a process of successive crack re-initiations resulting from material damage in the crack tip zone. The main parameters of this model are the crack tip radius and the elementary block size. Experimental FCG data obtained for S355 carbon steel showed that assuming the elementary block size with the same value of the crack tip radius to collapse FCG data using UniGrow model is non-coherent with experimental evidence. In this sense, a new approach is proposed by establish a clear distinction between crack tip radius and elementary block size. The value of the crack tip radius, ρ, was defined by correlation with experimental and numerical values of residual compressive stress field ahead of the crack tip while for the elementary block size, ρ, a new expression was proposed which relies on effective stress intensity factor range and cyclic yield strength. This research intends to be a valuable contribution for the implementation of UniGrow model to assess the fatigue crack growth of a material.

Original languageEnglish
Article number107120
Number of pages13
JournalInternational Journal of Fatigue
Volume164
DOIs
Publication statusPublished - 2022

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Crack-closure
  • Fatigue crack growth
  • Local approaches
  • S355
  • UniGrow model

Fingerprint

Dive into the research topics of 'Fatigue crack growth modelling for S355 structural steel considering plasticity-induced crack-closure by means of UniGrow model'. Together they form a unique fingerprint.

Cite this